PIPPA MIDDLETON has done her good deed for the day, donating her own bike to charity to raise money for the British Heart Foundation.

The 30-year-old, who is the sister of Kate Middleton, this morning donated her signed, bespoke bike - which she recently pedalled 500 miles across America on - to be sold on the BHF’s eBay site to fund life-saving research.

Speaking about the good deed, she said: "The challenge of riding across the Rockies, coping with the heat of the Arizona desert and climbing over 170, 000 vertical feet in the six days was incredibly tough, but every inch of the 3,000 mile race was worth it, to help the BHF fight heart disease.

“I wanted to complete this challenge to help raise awareness of the importance of heart health after learning that coronary heart disease kills nearly three times more women than breast cancer1.

"So whether you’re inspired to get fit or you’re a cycling fanatic wanting to add to your bike collection, visit bhf.org.uk/ebay to bid now. I’m keen to raise as much money as possible to help the BHF fund life-saving heart research.”

Pippa, who is sisters with Kate Middleton, is doing her bit for charity [BFH]

The socialite recently pedalled 500 miles across America [GETTY]

Pippa, who is an ambassador for the charity, completed a month-long cycling challenge titled Race Across America raising over £20,000, so far, through donations.

And the additional donation of her bike is expected to attract interest from cycling fans and collectors alike.

The auction went live on Sunday August 3rd at 9am - and will be open for ten days before the lucky winner wins the Dassi bike, which was specifically designed to optimise Pippa’s performance and has a 50cm aero carbon frame and is worth £2,500.

Half the funds raised from the auction will be donated to the Michael Matthews Foundation [GETTY]

Half the funds raised from the auction will be donated to the Michael Matthews Foundation which helps to provide education to children all over the world.

Pippa also completed the Race Across America challenge in aid of the Michael Matthews Foundation, alongside the BHF.